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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7fffcae1f336608eba0415ab230c37df56f7cc0ee0119834b91fa5b00d70af' 
  AND token = 'S/TNc6fmCiKj6X7N72WxxHeeBUVPZNq+28RUdj201uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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