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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913ef559414deb2d64c00a7761be0c51f58fa0796b030aa0d405014234ba95cf' 
  AND token = 'dfuEs30t3PNMXqZWhwlTCT6EpggYkM7QIet/d1+gtVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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