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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977ec6256bb32c5e849971368622fa5d104642ed733e4c76ba64ea9ab9c4e779' 
  AND token = 'TV0DMBYPgjneEe5bQlup04ph0erU5E/yK7awC5Iw4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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