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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7eb576b0165337ddb2d2da095d3585495c12d89542fb9335b40f3686ab3c3ad' 
  AND token = 'Svyfpfl+sb5wPrWbTWG5eeCgNrme/sQCjamyTvwrQSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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