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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e89fd2defc08e00d6a2f18af05b1c9ddb762fc7f6020dba228f0c7b55bce8d' 
  AND token = '6uhU4UHRx4dH5lEUFaTFYIy2EL+7edAeeRxehgwzehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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