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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3646bc15bd174ed38c4d8aa67c9966a6839d7d4e77831d62f4a2706538d84f9' 
  AND token = 'K3Cahk4s9dydJn8fC0foQx1EhNgQqJQyrC7UnxZumw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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