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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb90c680e78896776e05dc084c8cca817a774f483f91fffb4112a1d37a47a73' 
  AND token = 'SeKIskR5T8ko0BT31rbMiTA1S7uGJoTzXtv3eeyiyPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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