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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb0e71eaed8b163a02cdf3148f82bd777b7b79c2692af0cc59deddcc11df814' 
  AND token = 'PgkYXCFlaNM7Ld6QH7B1kR555SmOCRaB3sA9del/xlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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