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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed427a6a7028b8434542e623e99224b576cbc40080bde744eb4251422d92ffe2' 
  AND token = 'WM7jK7DPC4MJH+fTJy2xSbFU3ZaNcizclBil8sMfdl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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