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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee50954fa649b65c67b1b47d74bebfc4270afe0fae204910bf920796607fd84' 
  AND token = 'K+HEne/xs/hElbXvZie/AVGsTrOoyXOsoQj5Cu2UUzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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