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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7627a528b078366b6d33cb8de8c2b266c01214997b46027a2ff7497e1ae25f5c' 
  AND token = 'OqJ9tTLhEQnZU6Zjsx8zLAKAcLurDhD+NNMnduJ32g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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