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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38bb39887bdc3b25cf25c83e1fbca84620703cac4be6d3e4f95caeb683e602e' 
  AND token = 'TldCwxb1NoxMX6k9sCq47f9Tygei2OU+4TpFtCuDluA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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