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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4cbc0cb4109a63a5459f8692f80a68b64ce2749f69617593efcee7c708cf34' 
  AND token = 'eSr74RIvhNX8sAVNSHD3v06c45/izDbrj9seLXOF8RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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