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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e83b37d00a2175fa53ec8a4b6d6efb89dc5716e2a72b1e30f0d92748378b33' 
  AND token = 'sfyY4oJUAyE++x2PKOj/ycgiJN0NK1BJynR6svbS5ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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