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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ef01d1033abdd93d31ea3cfac49ab90365ac12b2e184990fc95fec7f951577' 
  AND token = 'cWfEGqNGtyIu7xf/VbSeYXkHnaMSDdMYc1YTSkZQ1TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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