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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ae1147915f6e4f95ecdffee50543d60fbf0a4a757dbd5e882d81855397b86f' 
  AND token = 'sxZ/u3M+77bKl7YnoKw1Pn6mIeXqsi8Z50SDtMu+soc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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