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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1ee0e9607cd4862405c67f7b0b79a435e4a236d7e426b34ca636a163e3c3cc' 
  AND token = '7Uu50TJjxxAqE3PcFinSFqHdFMjI+wTVI1MW0J0wJ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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