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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4462224d7c66f9ead44e1de7e9ded50c0ad7540c1cf76d53ddd93e932dce8168' 
  AND token = '/7RkKtRfPNmbisnZRzAFCdNK9+LyifhgRgV8NYrPdcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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