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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f914234f575868859b98b2abcfe703eb40e3e05209ce6a043dd68be9a9f2d9b' 
  AND token = 'Cwj71Pr9CnHo9dpGNmk2gdeclMz/fbJ97kfXGzPzEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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