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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b033f3512f14000036d2317c8f7494875cf6dcf0453ab5fbea17d343d8d04ba' 
  AND token = 'kf+FJRhg8XeotVP+fo/FHdjtHcK/xCqgF3NEUeDalr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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