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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3eceaf4e6fb7ad506cb651272f2319538ef6b9673bb6795de55c10e45a1d5d' 
  AND token = 'MU9PvjDSm883U7Lvl0T8JoJCAj5jTTtg8pybeNOCV9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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