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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb42e1c215584bf07e17ecf27e3380df3f2998f44c6dcafcb98d9ad6986fa19' 
  AND token = '3htB78ErVrmjryNJP/smttxqR7Z8OY8VzMPAJefGQ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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