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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b556eb354daee420ab7cce80b8d76eb14b60e8e50860e616106e54c0d0ebf68' 
  AND token = 'iD6q2+xcm+WO7Cay3FdhZn5Z+suIOzPwluxLu7zxiEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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