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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd367f315aac07c45bbd956590309f961a29a980c7b67ae506a6a1a8fef0f08e1' 
  AND token = 'aygUhENNREm/QbwGCbGOSVa8uKoGdh+U7KAU7HslU+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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