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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0979892f3a333b66a0965cb41dfafd68f450cea3bce9b1bf4d73074add9cca' 
  AND token = 'jKKfLQaq2xZrLqaYfs2peUmQqK93LS53gZPkYtQT7c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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