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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946518eb6df519f5ab238c31da769f07fa78b1c48eed3a1f2cd32e92cb5fcd89' 
  AND token = 'DIiGBkc88bw8qGL8lPs3zsEei/9bXAoxvcljcUBtH/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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