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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d931d0b4d1708ca0f789498a8d9a9e6a8ba5412252eb2f1a7b3fefbec34560' 
  AND token = '7/9etvvM661AnnycV1OFK66ypPcGx7MItI0fMUN5Zzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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