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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3afa0e898af0bb011ef3dc0b5d099b7740172657d3b4e5291990d09da89d79' 
  AND token = 'Srk0ieK38t/0dqxXQ7CEmuaT5yVS80CBS+Cm7rOTPnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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