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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcec99290dc8d32890d3336f220e3929b9c968a6a4f16a83baf645631f12ec8' 
  AND token = 'ZHk6A/a5XmXfuUlFtTq7zGh1U5zPIJRMTC5DAb4Ldpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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