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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a6f3b2cc59db3f77f62ea84917a83aac5e7d434c3659adbeb5265ed38f96de' 
  AND token = 'J7g+2GogjAJ5WpzZUThzoN0DN+2iftneFzcD6M91hzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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