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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fc7faca3b8bfd300725be8aa7ac354e6c30b1817847fc32be15031d267cc79' 
  AND token = 'FRkxYtI90ch4ra7RV7y8uj374AM8kIqF5l5IKrZpu1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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