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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbda16b2fb3537e3febddda337cce5a9e35dcec18689b6df1a32082feb532c8' 
  AND token = 'oGL7z/493oPaclmaeTQkh2NeVRFiwLfOmr65XJBJhwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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