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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c2a0796c63ecdd3fc481ceaadfb8980f8f72a2b3b537b98d8045fbb7876dac' 
  AND token = 'yoYrMGifz7hHuu99SxHQKEnNc5ffZfsz9YDmsALAMgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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