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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31a7663aac0854c309c7bf8d992eb6622f94c7ec6c73d978969d55237c80d33' 
  AND token = 'oyAY94HI7EuC55P0z0ZFgRFBO86N/8hjUv0tqWxMUKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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