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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6692a2d651e381da0c2876fb1017b530fd73ed9b3b881d017c2b49d84c8833' 
  AND token = 's3xPAJURhiqk0snynMnNkO4K5BowC+a8czaZt8+tD/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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