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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d4861a8fc0d31ea926768cff81849fecc913022f4397b4c489f415ac08f29c' 
  AND token = '6LGWDLD1CL+YAGym5n9d4RxdY4ZD+Ea/j2Wfy26REL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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