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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfe97624dec956fc583f2f6afa039711a991a2c5633bdd67ca8f0da28aac4e5' 
  AND token = 'FkJ1vpiNfSung85Yd3EcZIyUBZm44QEIm3l80ZY1qrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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