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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010ef99824e134a031994ebb404e236f653e5a700e51d7b2c659f10df9ebcfb6' 
  AND token = 'jsyUnH2RbdJhAJmR16/S1HUjM0Tw5KPrb+auZ+xBWOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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