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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6586c2c9def0bad1284f55d9fdd25053a511ab0cfffc46335578b2958e1bd119' 
  AND token = 'l8AjivDXn8l3FPpSIEMiiIRTxZEoMkTN29Eq4M9rGMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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