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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec6f816d8b2810618e9499405eb088870259ae8d152bffb16afa6b6d0df10b9' 
  AND token = 'k+1yF7F4fvT4DlKSMzPushduUaOGBlrlMIfUFQ3HdYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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