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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c48c0aa9b4f8146bcc5bd7163921fa4cd7c1e7fdb4033e204d9c65dac7eed8' 
  AND token = 'h6s9L9FYu91nrGYRm16q22l4lIisYds5QaWOQbO9wZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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