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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cc511f6c50f15e3ffcd4e6da4398c57d114c627569394cc4b7321cdbba5baa' 
  AND token = 'rzuIBP5bM4ieOAb6C3MLVqXY53G7yfog8X37TINDPuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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