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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df619557b65097c343ebcb5b776e1f825b670427b457599bc580e762bc3df32' 
  AND token = 'SXROSdfrl4sqP52xy2giiQ2czl3x/D9K7gI6tp/2UrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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