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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05690b0faba7ec863d44448437508232964fce883a256c5cfee2cb384db77ae1' 
  AND token = 'JY+Qmzn+R9nFPQ8TGxqqx1h8EQmZ9qQeHzv8ipTbeOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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