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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfac336492f38ab534cd26406c164d434d6bec040111b9a9e72c9159f31f493' 
  AND token = 'MOtSKCORgOcsrxuvyAD8rCJ58t42htN9wAl70f5c4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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