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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930fb102b4e4325b0a351d017a8bbb141e0f50ba51aa2736e4581d4798041a16' 
  AND token = 'qDHD+pi6iYTDceznbTQCATpikCC4Wi3/XCjLwf5Fdg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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