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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99310dd6e89702e6b9a33b7ec1bea51a2799e836bb34b3446b624902318678d2' 
  AND token = 'QCCWFObSedoUORs5wC7FGvcLNGjQQJ6Cp+lNe3UXJL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}