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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db072ed885b70f54bf95bfc1cb1a1c4dad43924170094cff1ab5863448c991e3' 
  AND token = 'icTag/6ZWn14mdIxnKGahMI5341Q8qJ0DV6n3KbnwhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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