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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0933248209d89aa7951bc3f9e81077dccd4b5e35421592d40cab8e0ad7487d' 
  AND token = 'u5/GXT6MLmBC1pIBLWn2o4vXo/gt4NpvpCgX/vkVG3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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