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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815907ee30fefad0c79b90b8d7b9aeb63544a4903005908d3a4ab9ab4c0eab31' 
  AND token = 'clmTwSIJTJ4FdxRj7pLShK4iI13I//1l2RdJ2L5FKbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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