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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204bc04e66232feba4be0a7a1db7278b784f7870983bcab57cdba76a7fb87e92' 
  AND token = '54eXuVFYs+r88WfBP3LgKMFBtqPbhkMte8z0pxZvbKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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