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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eecadccfb40743daf73adb5cc0ab0e0e1ec771bb3f9d726ab7dfcdcf2da0d83' 
  AND token = 'Bs/RxrZvRpWEYSe86jZG0RgnxKcPaM3QxyzwKq/QnWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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