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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bad51c475fc24614f31862e413d06f1cfa655585e7a957c8f6ba9cdf7504f2' 
  AND token = 'TLcH/qoOJsp+LW1B5/sbD52ZoBFe0iZu3qt9Z/9g7HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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