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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1d62f7374151d41ece6b7352478f7bcb4d14c9b63c6907e5182c56b781bcf0' 
  AND token = '2Mc+js9rFDj6WRh5PFx97V5O4v/rAfIpiLvsZJa8LoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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