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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1382284fdb665e6cc512db33026c0d3159c8cb9fc690fa55cb5a297086c25f' 
  AND token = 'x644t2HlQ9ApBwd1l9hGT8MAL9HKxAG0XoveExdE7dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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