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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c7ab47b1eb13dbe02edf71a9ccb6c70cdf979e095608c1489ec5cb7b455392' 
  AND token = 'NuUpHAbqUtl2fd1QTNCoXwUN69o5J6TAoSE9gOma2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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