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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6a09fe0a0e08b87cb3a935019a8a35f05c14e1e7eb4fa30fa3db33ee088c67' 
  AND token = '/G6MxRHzGomsYOvpCY48zdejLSaT0A32zNGx4KETv+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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