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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76ef735dc7d8dbaaa97114d6e9f27ce6933ff37b9a9bcb8e0283b2c7e043eb7' 
  AND token = 'JlGAU+IB5konufUX+B5Kbd/bLeueE24xZU8zoT12f5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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