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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c121402fee178ce60ef2cf43614d858f73901522cdade8b472cf75eae4d8ad5f' 
  AND token = '4leFjJMZ5hJc3J7Rwh9OqNaUt0sahx62bk3mrdbv4Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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