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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eefad2a2157daefb5be8d526066ba1b318b65561c3cdc283a74841b645a514b' 
  AND token = '9F6KZur0S0YBg1OIhIPJ6dE69H3TFsAKCYAADem+ioc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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