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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04f235f40e109e0f032baf1a8bd33d448c51915b94fe0509425622ec617518b' 
  AND token = 'xoWvZ1zl7NFfERLKOYgDMpigGE4moAsLxA40Wc4p7Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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