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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831938f4d2df1072e132bddae48b471ed52ada0dccea9fc42dcb88151f238c72' 
  AND token = '6yLfhEtATElNu2kM1wQZTKE3eZwQc5zw56EGzNoplBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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