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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31255fe8784c9bba9027766f0a25caff021a776decd2a940563f72a70d209a69' 
  AND token = '8ulgr6Tbqg31WO4N0YwjWcytfIpI2KAYBTZDAPbnCWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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