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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a40287453e36c5e6d54900c661e5b8a92b60f769f0a63493c073bc0febd47a3' 
  AND token = 'fXcPBDjlKtlj84R5kUf1pf+EarpCZuthNpTXzCY3dmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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